2011ApJ...730..124C


Query : 2011ApJ...730..124C

2011ApJ...730..124C - Astrophys. J., 730, 124 (2011/April-1)

The thermal evolution of ices in the environments of newly formed stars: the CO2Diagnostic.

COOK A.M., WHITTET D.C.B., SHENOY S.S., GERAKINES P.A., WHITE D.W. and CHIAR J.E.

Abstract (from CDS):

Archival data from the Infrared Spectrometer of the Spitzer Space Telescope are used to study the 15 µm absorption feature of solid CO2 toward 28 young stellar objects (YSOs) of approximately solar mass. Fits to the absorption profile using laboratory spectra enable categorization according to the degree of thermal processing of the ice matrix that contains the CO2. The majority of YSOs in our sample (20 out of 28) are found to be consistent with a combination of polar (H2O-rich) and nonpolar (CO-rich) ices at low temperature; the remainder exhibit profile structure consistent with partial crystallization as the result of significant heating. Ice-phase column densities of CO2 are determined and compared with those of other species. Lines of sight with crystallization signatures in their spectra are found to be systematically deficient in solid-phase CO, as expected if CO is being sublimated in regions where the ices are heated to crystallization temperatures. Significant variation is found in the CO2 abundance with respect to both H2O (the dominant ice constituent) and total dust column (quantified by the extinction, AV ). YSOs in our sample display typically higher CO2 concentrations (independent of evidence for thermal processing) in comparison to quiescent regions of the prototypical cold molecular cloud. This suggests that enhanced CO2 production is driven by photochemical reactions in proximity to some YSOs, and that photoprocessing and thermal processing may occur independently.

Abstract Copyright:

Journal keyword(s): astrochemistry - dust, extinction - evolution - infrared: ISM - ISM: molecules - stars: pre-main sequence

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 2MASS J03283450+3100510 Y*O 03 28 34.501 +31 00 51.01           ~ 71 0
2 NAME [BM89] L1450D DNe 03 28 36.8 +31 15 20           ~ 51 0
3 LDN 1450 DNe 03 29.6 +31 20           ~ 59 0
4 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 297 0
5 2MASS J03331667+3107548 Y*O 03 33 16.68 +31 07 54.9           ~ 111 2
6 2MASS J03470544+3243084 Y*O 03 47 05.447 +32 43 08.43           ~ 54 0
7 NAME [BM89] B5 DNe 03 47 38.3 +32 52 43           ~ 221 0
8 IRAS 03445+3242 Y*O 03 47 41.603 +32 51 43.79           ~ 187 0
9 HH 366 HH 03 47 42.4 +32 51 44           ~ 23 0
10 LDN 1471 DNe 03 48.0 +32 54           ~ 305 0
11 HH 360 HH 04 04 43.0 +26 19 00           ~ 7 0
12 IRAS 04016+2610 Y*O 04 04 43.07064 +26 18 56.3904           ~ 246 0
13 NAME IRAS 04114+2757G TT* 04 14 30.5508810936 +28 05 14.596567332           M2.2 50 0
14 IRAS 04154+2823 Y*O 04 18 32.0443900008 +28 31 14.971419300           M2.5 61 0
15 2MASS J04183444+2830302 Y*O 04 18 34.44696 +28 30 30.2256           M0 43 0
16 IRAS 04181+2654 Y*O 04 21 11.46888 +27 01 09.4044           G0-M3 61 0
17 [EM98] DG Tau B cRN Y*O 04 27 02.66088 +26 05 30.4548           ~ 157 0
18 V* DF Tau TT* 04 27 02.7932020080 +25 42 22.453341516 11.97 12.25 11.42 10.31 9.14 M3Ve 478 1
19 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 791 1
20 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 836 0
21 IRAS 04365+2535 Y*O 04 39 35.19360 +25 41 44.7252           ~ 260 0
22 Kim 1-38 * 04 39 38.8654791216 +26 11 26.646511596           K1III 129 0
23 IRAS 0437+257P08 Y*O 04 39 55.7457478224 +25 45 01.941104988           B5 167 1
24 ITG 25B Y*O 04 40 07.71192 +26 05 23.6040           ~ 6 0
25 IRAS 04370+2559 Y*O 04 40 08.0045430960 +26 05 25.434085020           M 56 0
26 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3955 0
27 NAME HH 46-47 HH 08 25 43.6 -51 00 36           ~ 189 2
28 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 307 1
29 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1069 1
30 IRAS 11057-7706 Y*O 11 07 09.19896 -77 23 04.9920           ~ 59 0
31 NAME Cha II MoC 12 54 -77.2           ~ 316 0
32 2MASS J12590656-7707401 Y*O 12 59 06.56 -77 07 40.1           K4.5 47 0
33 CG 12 CGb 13 57 42.2 -39 56 21           ~ 48 1
34 Barnard 228 cor 15 43 00.9 -34 08 48           ~ 65 0
35 IRAS 15398-3359 Y*? 15 43 02.21016 -34 09 07.7112       18.38 21.72 ~ 149 0
36 WL 5 TT* 16 27 18.17064 -24 28 52.6800           ~ 88 0
37 CRBR 2422.8-3423 Y*O 16 27 24.61320 -24 41 03.4080           ~ 86 1
38 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3361 1
39 IRAS 16285-2355 Y*O 16 31 35.65752 -24 01 29.4708           ~ 115 0
40 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1018 2
41 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 138 2
42 CK 2 Y*O 18 30 00.618 +01 15 20.12           K5-M0III 52 0
43 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 99 0
44 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 440 0
45 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 92 2
46 [S2009] L723 XMM 8 * 19 17 53.1327617040 +19 12 16.426495764           ~ 38 0
47 LDN 723 DNe 19 18 12 +19 13.6           ~ 153 0
48 2MASS J21472204+4734410 * 21 47 22.04 +47 34 41.0           G0/M4III 9 0
49 IC 5146 OpC 21 53 29 +47 14.8           ~ 426 2
50 PSCz Q23238+7401 Y*O 23 25 46.65 +74 17 37.2           ~ 54 1
51 LDN 1262 MoC 23 25 47 +74 17.6           ~ 131 0

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2022.07.06-10:01:51

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